Blasting device



Aug. 12, 1930. F. A. HALvERsoN BLASTING DEVICE Filed Sept. 8, 1928 .N..w WNV .NLMMRN NNNN Patented Au, i2, l93

ljiiii FK AUGUST HALVERSON, OF GLEN RIHEY, PENNSYLVANIA BLASTING DEVICEApplication nled September 8, 1928. Serial No. 304,826.

The resent invention relates to improveorder to provide a shoulderagainst which the ments 1n blasting devices and more particupellet 8 mayengage.

larly refers to an improved pellet powder r- On the barrel and spacedfrom the ends ing tube with automatic air cushion shot atthereof arerings 12 and 13, themselves spaced a tachment. apart and acting toconfine the adjustable col- An obj ect of the invention is to provide anlar, which is preferably made up of the two improved. blasting devicewhich will insure a washers 14 and 15 welded or otherwise sesafe andunfailino detonation with squibs, cured together for mutualreinforcement. electric squibs and electric blasting caps in The collarhas a limited axial movement on all types of shooting operations. thebarrel, between the rings and is frictional- 5 A further object of theinvention resides ly litted to the barrel whereby to remain in adinproviding an extremely simple device for justed position. In Figure 1 isshown an air the above pur ose in which economy 1n the cushion space 16lying between the collar and use of materia is promoted. pellet.

With the foregoing and other objects in In operation, the end 6 of theblasting tube e View, the invention will be more fully de- 5 isinserted, say for about four inches, into scribed hereinafter, and willbe more partie4 the round center hole 7 of the pellet, and the ularlypointed out in the claims appended pellet is pushed firmly against theadjacent hereto. end of the barel 11, which is say four inches In thedrawings, wherein like smbols relong. The barrel will hold the ,pelletin 1 fer to like or corresponding parts t rough-out place. Thereuponinsert the pellet, so afxed the several views, to the tube, into thebore hole 9 and push it Figure 1 is a side view, partly broken away,back to the end of the hole, as shown in Figof the improved device shownas in place ure 1. The collar 14,'15 is adjusted along the ready foruse. barrel, to the required position for giving the Figure 2 is alongitudinal section. desired length of cushioning air space or gapFigure 3 is a cross-section .taken on the line 16, before inserting thedevice in the bore 33 in Figure 2, and hole. 1When the device is movedto final po Figure e is a cross-section taken on the line sition thestemming 10 is introduced by use 4.4 also in Figure 2. of a coppertipped or other tamping bar with Referring more particularly to the daW-the groove of the bar placed against the blastings, which show only oneembodiment ofthe ing tube 5, The Collar 14, 15 acts as an abutinvention,5 designates a blasting tube, hOlvment to arrest the stemming and toprovide low to receive the squib or fuse (not shown), the Spacelf, whichmay be two 01- three inches 3.3 and having one end 6 beveled, forinsertion in in length, A Squib is placed iin the hollow the bore 7 0f-tbe ,pellet 01 pOWdGI Chil'g@ S- tube 5 and lighted, whereupon suchsquib will The tube 5 extends from the pellet, which iS run backwardinto pellet powder 8 through lodged in the base of the bore hole 8, tothe a clear passage, and shot will instantly follow. mouth of such borehole, where it is accessible In shooting pellet powder today with 4o forsetting off the charge. The stemming squibs, miners and shot firersexperience troumaterial, indicated at 10, is used to fill the ble inpushing the pellet back because of the bore 9 following the usualpractice. miners needle being small and the pellet will A barrel 11 ismounted over the tube and is not go to back of hole without beingbroken-- preferably welded or otherwise aiiixed to the with the blastingtube this could not happen,

tube at a distance from one end thereof in as the cushion attachment islarger than the :firing hole in the pellet and will hold the pelletfrom' slipping back when being inserted. In stemming the hole underpresent methods, miners break the pellet when back with the tamper andpulverize it, in order to insure soft powder for the squib to ignite.This is a dangerous practice and it makes really two explosives in oneshot. The fine dust of pellet will flare an instantbefore the solidpellets are ignited and part of the explosive force is lost and of novalue. Furthermore, an excessive amount of smoke is created. Inaddition, in pulling the needle out of the hole through the stemming,the point of the needle will oft-times become bent by the heavy tampingbar and, of course, abent needle point will cause part of the stemmingto fill the hole so the squibs progress into the pellet is blocked andthe shot is not fired.

This means loss of time, loss of labor and loss of powder to the miner.Anything of this nature could not happen when the blasting tube was usedas the hole in the tube would insure a clear passageway for the squibinto the pellet and the cushion attachment would stop the tamping frombreaking the pellet into dust in the stemming.

The cushioned eii'ect of all shooting is universally recommended bmining men because 3f its non-shattering ei'ict on coal and othermaterial and the barrel arrangement with :ollar and rings to hold it andto make it adinst-able to whatever distance is required to secure bestresults can easily be arranged to ocal conditions. Also the collar willhold the itemming from crushing the pellet into dust.

All of the parts are preferably of copper to :omply with the rigidmining law.

It is obvious that various changes and modications may be made in thedetails of contruction and design of the above specifically lescribedembodiment of this invention withut departing from the spirit thereof,such hanges and modications being restricted `nly by the scope of thefollowing claims 1, An improved blasting device comprisng a tube havingone end adapted to be fitted ito the bore of a pellet and adapted toreceive squib, a barrel on the tube spaced from the iserted end of t-hetube and abutting against de end of the pellet, and an adjustable rein-Jrced collar on the barrel for receiving iereagainst the stemming toform an air ishion space between the pellet and stemung.

2. An improved blasting device compris- 1g a tube having a beveled endto penetrate powder pellet charge, a barrel on the tube n abut againstthe pellet, spaced rings on the irrel, and a collar :trictionally andadjustily mounted on the barrel to form an abutent for the stemming anda cushioning space ljaeent the powder charge.

3. An improved blasting device, compris- FRANK AUGUST HALVERSON.

